Catalysts for the destruction of halogenated organics

Abstract

A new class of metal-exchanged, metal-impregnated zeolite catalysts has been prepared for the oxidation of halogenated organics including chlorinated, fluorinated and chloro/fluoro hydrocarbons. These catalysts are supported or unsupported, comprising from 0 weight percent, hereinafter wt.%, to about 95 wt. % of a binder, from about 10 wt. % to about 95 wt. % of a metal-exchanged zeolite, and from about 0.2 wt. % to about 12 wt. % of an impregnating metal compound, said percentage being calculated as the metal loading on an oxide basis, where the metal in the metal-exchanged zeolite can be selected from the representative and illustrative group consisting of V, Cr, Co, Ni, Cu, Fe, Mo, and Mn and the impregnating metal compound can be selected from the representative and illustrative group consisting of compounds of Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Mo, Pd, and Pt. A process for making the catalysts and a process for the oxidation of the halogenated organics are disclosed which occur at relatively low temperatures, from about 100° C. to about 650° C., and at pressures near atmospheric and for residence times from about 0.01 seconds to about 20 seconds.

What is claimed is: 
     
       1. A process for the destruction of halogenated organics comprising the steps of contacting a mixture of the halogenated organics with pure oxygen or an oxygen containing gas in the presence of a catalyst comprising a metal-exchanged, metal-impregnated aluminosilicate zeolite, wherein an exchanged metal in the metal-exchanged, metal-impregnated aluminosilcate zeolite is selected from the group consisting of V, Cr, Co, Ni, Cu, Fe, Mo, and Mn and an impregnated metal in the metal-exchanged, metal-impregnated aluminosilicate zeolite is selected from the group consisting of Ti, V, Cr, Mn, Fe, Co, Ni, Cu, No, Pd, and Pt, and further where the exchanged metal and the impregnated metal are different, and wherein the difference between the exchanged metal and the impregnated metal varies a temperature necessary to promote oxidation of the organics and for a contact time of about 0.2 to 1.0 seconds, sufficient to destroy the organics. 
     
     
       2. The process according to claim 1 wherein the time is from about 0.01 to 20 seconds and the temperature is from about 100° C. to about 650° C. 
     
     
       3. The process according to claim 2 wherein the time is from about 0.2 to 1.0 seconds and the temperature is from about 150° C. to about 450° C. 
     
     
       4. The process of claim 3, wherein the catalyst contains a support. 
     
     
       5. The process of claim 4, wherein the support is selected from the group consisting of alumina, aluminum oxide, silica, silicates, silica-aluminas, aluminum-silicates, titanias, and cordeirite. 
     
     
       6. The process of claim 5 wherein the support is a honeycomb support. 
     
     
       7. The process of claim 6 wherein the catalyst contains a binder. 
     
     
       8. The process of claim 7 wherein the binder is selected from the group consisting of alumina, silica, alumina-silica, cordierite, titania, zirconia, vanadia and other inorganic materials used as binding agents. 
     
     
       9. The process of claim 8 wherein the catalyst comprises from 5 wt. % to 46 wt. % of the binder, from 2 wt. % to 12 wt. % of the impregnated metal, and a remaining balance of the metal-exchanged aluminosilicate zeolite. 
     
     
       10. The process of claim 6 wherein the catalyst comprises from 2 wt. % to 12 wt. % of the impregnated metal, and a remaining balance of the metal-exchanged aluminosilicate zeolite.